Supporting bracket



FIG. 1 is a perspective view of a supporting bracket showing my design in one state.

FIG. 2 is a front elevational view thereof.

FIG. 3 is a rear elevational view thereof.

FIG. 4 is a left-side elevational view thereof.

FIG. 5 is a right-side elevational view thereof.

FIG. 6 is a top plan view thereof.

FIG. 7 is a bottom plan view thereof; and,

FIG. 8 is a perspective view thereof shown in another state. 

The ornamental design for a supporting bracket, as shown and described. 